4. Subjects must be generally healthy, but may be enrolled with a stable, chronic illness, if it is well controlled and does not interfere with the primary objective of the study. Subjects may be included with clinical deviations from normal limits in medical history, physical examination, vital sign measurements, ECG, or laboratory test results that are associated with stable, well controlled chronic illness. Subjects with concomitant diseases or using concomitant medication will be allowed to participate provided a stable condition and stable treatment for 1 month (30 days) prior to administration of the first dose of study medication. Inclusion of each subject will be reviewed with the Link Medical Monitor prior to enrollment in the trial.